Spent a few hours last couple days tearing apart this complete harness and checking every single wire end to end. Still had 5.xx volts coming out of a sensor ground and an ECM ground. So I pulled the wires from ECM so I could check what was happening at ECM without wires...
Voltage went up a little to 8.1 volts on a sensor ground and a ECM ground?
Power in on Orange wires is 12.xx and so is key on Power on Pink/Black wires, ohm'ed every wire in system to be fine, by now probably quadruple checked all wiring...
1228708 ECM. Green C5 Sensor ground and C6 ECM ground. There are a couple other abnormalities in voltages from the test list but just variables... other sensor grounds are fine. One other abnormality from wiring diagram to this ECM and harness we pulled from car is it had 2 Batt Orange wires going in a D17 which is listed in wiring diagrams. But ECM and harness came with Batt Orange also to C1 which in diagrams says "Not Used" That pin with no wire does measure same 12.xx volts as D17.
Never had dealt with this before? Is this a faulty ECM?
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